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November 20th, 2008, 08:17 PM
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Regular
2005 Mustang GT
11.88 @ 118
Join Date: Jul 2008
Location: Conroe TX
Posts: 395
 iTrader: 0 reviews
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GT500 fuel pump duty cycle
Ok, I've got some tough tech questions. The rundown...
2006 mustang gt 60mm turbo 60lb/hr injectors gt500 twin fuel pumps single fpdm stock blow through maf I think this is enough to get started on. I was data logging to see what was going on since my fuel system is not up to par. Around 4500rpm under wot while its at full boost the fuel pump duty cycle goes to 50% and stays there. At the same time the fuel pressure drops to 8psi. Is the duty cycle staying at 50% because of the single fpdm and having two pumps, or is there something wrong in the tune thats not letting the pumps spool up. I'm new to these returnless fuel systems so I'm still learning. Highest maf count I saw was 455. I'm probably going to get a wideband tomorrow to see what the af ratio is doing. Gurus please chime in here.
__________________
Turbonetics single 60mm 
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